JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties
The first ionization enthalpy of \(Na , Mg\) and \(Si\), respectively, are: \(496,737\) and \(786\; kJ\; mol ^{-1}\). The first ionization enthalpy \(( kJ\; mol ^{-1})\) of \(Al\) is
- A \(487\)
- B \(768\)
- C \(577\)
- D \(856\)
Answer & Solution
Correct Answer
(C) \(577\)
Step-by-step Solution
Detailed explanation
\(I. E\; : \;Na < Al < Mg < Si\) \(\therefore \quad 496<\operatorname{IE}( Al )<737\) Option \((C)\), matches the condition. i.e \(\operatorname{IE}( Al )=577 \;kJmol ^{-1}\)
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